Indian Defense Hanging Piece Puzzle (Rated 858): Spot Back Rank Mate — Mate in 1

This puzzle is a classic back rank mate pattern in a middlegame setting. The key idea is that the enemy king’s escape squares are restricted by its own pieces and pawn cover, while a rook on an open file can deliver a decisive check. Even when material is balanced or favorable, king safety can override everything. Here, the tactical shot works because the defending side has no useful flight square and the critical file is completely exposed.